Anaplastic Meaning of Anaplastic A term used to describe cancer cells that divide rapidly and have little or no resemblance to normal cells. Also See: Achlorhydria Polyunsaturated Fat Anaplastic Thyroid Cancer Angiogenesis Inhibitor AGUS Atorvastatin calcium Antihistamine Alopecia Abemaciclib Adjuvant therapy ALSO SEE: Atypia